you have mentioned that your smps,amp,preamp is based on Kenwood KAC-716 . could you please post the original kenwood schematics (as used in kenwood amp) for reference purpose . i would be highly obliged.

I have seen quite a few references to winding a ferrite core, but haven't yet managed to find a good source for ferrite cores. Where did you get yours?

Thanks,

Chjris

hi, i've been looking for it here in my country...and i found out that those apc ups have it because it has an inverter 12v to 220volts....and probably all ups and inverter are a good source....hope you find one...good luck